JP2019119624A - Glass plate module - Google Patents

Abstract

To provide a glass plate module capable of preventing strain near the boundary between a shielding layer and an area without a shielding layer, and a windshield equipped with the module.SOLUTION: A glass plate module of the invention includes a first glass plate and a first shielding layer. The first glass plate has a first face and a second face, and a rectangular shape having an upper side, a lower side, a right side, and a left side on the periphery. The first shielding layer is laminated along the periphery on the first face or the second face of the first glass plate. The first shielding layer formed along the lower side is designed so as to have thinner thickness from the lower side toward the upper side.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a glass sheet module and a windshield provided with the same.

  The windshield in which the head-up display device is used is generally formed in a wedge shape in order to prevent double images. As described above, there are various methods for forming the windshield into a wedge shape. For example, Patent Document 1 discloses a windshield in which the thickness of the intermediate film and the inner glass plate is made constant and the outer glass plate is formed into a wedge shape. Is disclosed.

JP, 2017-105665, A

  By the way, the shielding layer (it is also called a mask layer) formed with ceramics etc. may be formed in the periphery of the glass plate used for a windshield. Such a shielding layer is formed in a dark color such as black, so that the amount of heat absorbed by the glass plate is greater than in the region where the shielding layer is not formed. Here, since the thermal expansion coefficient of the shielding layer formed of ceramic is different from that of glass, the amount of expansion due to the suction of heat is different between the shielding layer and the glass. Therefore, distortion occurs in the vicinity of the boundary between the shielding layer and the region where the shielding layer is formed due to the difference in the amount of expansion in the glass plate, and the image seen through the glass plate is distorted. In addition, such a problem is a problem which may arise not only in the wedge-shaped glass plate mentioned above but in a flat glass plate.

  The present invention has been made to solve this problem, and it is possible to prevent distortion from occurring near the boundary between the shielding layer and the area where the shielding layer is not provided, and a glass sheet module To provide a windshield having the

Item 1. A rectangular first glass plate having a first surface and a second surface and having an upper side, a lower side, a right side, and a left side at the periphery;
A first shielding layer laminated along the peripheral edge on the first surface or the second surface of the first glass plate;
Equipped with
The said 1st shielding layer formed along the said lower side is a glass plate module formed so that thickness may become thin as it goes to the upper side from the said lower side.

Item 2. Item 2. The glass sheet module according to Item 1, wherein the first glass sheet is formed to be thinner in thickness from the upper side to the lower side.

Item 3. Item 3. The glass sheet module according to Item 2, wherein the first shielding layer formed along the upper side is formed so as to decrease in thickness from the lower side to the upper side.

Item 4. The first glass plate has different concentrations of tin oxide on the first surface and the second surface, respectively.
Item 4. The glass sheet module according to any one of Items 1 to 3, wherein the shielding layer is stacked on a surface of the first surface and the second surface where the concentration of the tin oxide is high.

Item 5. The first glass sheet module according to any one of Items 1 to 4;
A rectangular second glass plate having a first surface and a second surface and having an upper side, a lower side, a right side, and a left side at the periphery so as to correspond to the first glass plate;
An intermediate film sandwiched between the second surface of the first glass plate and the first surface of the second glass plate;
Equipped with
A windshield, wherein the second glass plate is formed in a flat plate shape.

Item 6. The first glass plate and the second glass plate have different concentrations of tin oxide on the first surface and the second surface, respectively.
The low concentration surface of the tin oxide in the first glass plate constitutes the second surface,
Item 6. The windshield according to item 5, wherein the surface of the second glass sheet having a low concentration of tin oxide constitutes the first surface.

Item 7. The first glass sheet module according to any one of Items 1 to 4;
A rectangular second glass plate having a first surface and a second surface and having an upper side, a lower side, a right side, and a left side at the periphery so as to correspond to the first glass plate;
A second shielding layer laminated along the peripheral edge on the first surface or the second surface of the second glass plate;
An intermediate film sandwiched between the first glass sheet module and the second glass sheet;
Equipped with
The second glass plate is formed to be thinner from the upper side to the lower side,
A windshield, wherein the second shielding layer has the same width and thickness as the first shielding layer.

  The width and the thickness of the shielding layer may not be completely the same, and may be shifted if they are small.

Item 8. The first shielding layer is laminated on a second surface of the first glass plate,
The second shielding layer is laminated on a first surface of the second glass plate,
Item 10. The windshield according to item 7, wherein the intermediate film is disposed between the second surface of the first glass sheet and the first surface of the second glass sheet.

  According to the present invention, distortion can be prevented from occurring in the vicinity of the boundary between the shielding layer and the area where the shielding layer is not provided.

It is a front view showing one embodiment of a windshield concerning the present invention. It is the sectional view on the AA line of FIG. It is a figure explaining an example of the manufacturing method of a float glass board. It is sectional drawing explaining the cutting method of a glass plate. It is sectional drawing of a float glass plate. It is sectional drawing of the windshield of FIG. It is a front view explaining the streak of the windshield of FIG. It is sectional drawing which shows the state which laminated | stacked the shielding layer on the outer side glass plate. It is sectional drawing which shows the state which laminated | stacked the shielding layer on the inner side glass plate. It is sectional drawing explaining screen printing of the shielding layer to an outer side glass plate. It is a top view of the shaping | molding die of a glass plate. FIG. 12 is a side view of the furnace through which the mold of FIG. 11 passes. It is the schematic of a head-up display apparatus.

<1. Outline of the windshield>
Hereinafter, an embodiment of a windshield of an automobile according to the present invention will be described with reference to the drawings. The windshield according to the present embodiment is used to project light to be irradiated by the head-up display device and to display information.

  FIG. 1 is a front view of a windshield according to the present embodiment, and FIG. 2 is a cross-sectional view taken along line A-A of FIG. As shown in FIGS. 1 and 2, the windshield according to the present embodiment includes an outer glass plate 1, an inner glass plate 2, and an intermediate film 3 disposed between the glass plates 1 and 2. ing. And the shielding layer 4 is laminated | stacked on this windshield. Each member will be described below.

<2. Outer glass plate and inner glass plate>
First, the outer glass plate 1 and the inner glass plate 2 will be described. The outer glass plate 1 and the inner glass plate 2 may be known glass plates, and may be formed of heat ray absorbing glass, general clear glass or green glass, or UV green glass. However, these glass plates 1 and 2 need to realize visible light transmittance in accordance with the safety standard of the country where the automobile is used. For example, the required solar radiation absorptivity can be secured by the outer glass plate 1, and the visible light transmittance can be adjusted by the inner glass plate 2 so that the safety standard is satisfied. Below, an example of a clear glass, a heat ray absorption glass, and a soda lime type glass is shown.

(Clear glass)
SiO ₂ : 70 to 73% by mass
Al ₂ O ₃ : 0.6 to 2.4 mass%
CaO: 7 to 12% by mass
MgO: 1.0 to 4.5 mass%
R ₂ O: 13 to 15% by mass (R is an alkali metal)
Fe total iron oxide in terms of _{2 O 3 (T-Fe 2} O 3): 0.08~0.14 wt%

(Heat absorbing glass)
The composition of the heat ray absorbing glass is, for example, a CeO ratio of 0.4 to 1.3 mass% of total iron oxide (T-Fe ₂ O ₃ ) converted to Fe ₂ O _{3 based} on the composition of the clear glass. ₂ ratio as 0-2 mass%, the proportion of TiO ₂ and 0 to 0.5 wt%, framework component of the glass (mainly, SiO ₂ and Al ₂ O ₃₎ to T-Fe ₂ O _3, CeO _The composition can be reduced by the increase of ₂ and TiO ₂ .

(Soda-lime glass)
SiO ₂ : 65 to 80% by mass
Al ₂ O ₃ : 0 to 5% by mass
CaO: 5 to 15% by mass
MgO: 2% by mass or more NaO: 10 to 18% by mass
K ₂ O: 0 to 5% by mass
MgO + CaO: 5 to 15% by mass
_{Na 2 O + K 2 O:} 10~20 wt%
SO ₃ : 0.05 to 0.3% by mass
B ₂ O ₃ : 0 to 5% by mass
Fe total iron oxide in terms of _{2 O 3 (T-Fe 2} O 3): 0.02~0.03 wt%

  The outer glass plate 1 is formed in a trapezoidal shape, and has an upper side 11, a lower side 12, a right side 13 and a left side 14. Further, the outer glass plate has a first surface 101 facing the vehicle outer side and a second surface 102 facing the vehicle inner side, and has an end surface connecting the first surface and the second surface. Further, the outer glass plate 1 is formed in a wedge shape whose thickness decreases as it goes from the upper side 11 to the lower side 12. Similarly, the inner glass plate 2 is formed in a trapezoidal shape, and has an upper side 21, a lower side 22, a right side 23 and a left side 24. Further, the inner glass plate also has a first surface 201 facing the vehicle outer side and a second surface 202 facing the vehicle inner side, and has an end face connecting the first surface 201 and the second surface 202. Unlike the outer glass plate 1, the inner glass plate 2 is formed of a flat plate having a constant thickness.

  The intermediate film 3 described above is disposed between the second surface 102 of the outer glass plate 1 and the first surface 201 of the inner glass plate 2.

  The thickness of the windshield according to the present embodiment is not particularly limited, but from the viewpoint of weight reduction, the total thickness of the outer glass plate 1 and the inner glass plate 2 is preferably 2.4 to 5.0 mm. It is more preferable to set it as 2.6 to 4.6 mm, and it is especially preferable to set it as 2.7 to 3.2 mm. Thus, in order to reduce the weight, it is necessary to reduce the total thickness of the outer glass plate 1 and the inner glass plate 2, so that the respective thicknesses of the respective glass plates 1 and 2 are particularly limited. Although not, for example, the thicknesses of the outer glass plate 1 and the inner glass plate 2 can be determined as follows. In addition, the thickness of the glass plates 1 and 2 can be measured by a micrometer.

  The outer glass plate 1 is mainly required to be resistant to external obstacles, to have impact resistance, and to have impact resistance to flying objects such as pebbles. On the other hand, the larger the thickness is, the more the weight increases. From this viewpoint, the thickness of the outer glass plate 1 is preferably 1.8 to 2.3 mm, and more preferably 1.9 to 2.1 mm. Which thickness is adopted can be determined according to the application of the glass. However, since the upper side 11 is thicker than the lower side 12, for example, the thickness of the upper side 11 is 2.5 to 5.0 mm, the thickness of the lower side 12 is 2.6 to 6.7 mm, and the thicknesses of the upper side 11 and the lower side 12 A difference can be made into 0.1-1.7 mm.

  Although the thickness of the inner side glass plate 2 can be made equivalent to the outer side glass plate 1, for example, thickness can be made smaller than the outer side glass plate 1 for weight reduction of a windshield. Specifically, in consideration of the strength of the glass, it is preferably 0.6 to 2.3 mm, preferably 0.8 to 2.0 mm, and particularly preferably 1.0 to 1.4 mm. preferable. Furthermore, it is preferable that it is 0.8-1.3 mm. Also about the inner side glass plate 2, it can be determined according to the use of glass which thickness is employ | adopted.

  Moreover, the shape of the outer side glass plate 1 which concerns on this embodiment, and the inner side glass plate 2 is a curved shape. In the case where the windshield has a curved shape, the sound insulation performance is considered to decrease as the amount of debris increases. The dust amount is an amount indicating the bending of the windshield. For example, when a straight line connecting the center of the upper side and the center of the lower side of the windshield is set, the largest of the distances between the straight line and the windshield is used. Define as the amount of dust.

  Here, an example of a method of measuring the thickness of the windshield 1 will be described. First, the measurement positions are at the upper and lower two places on the center line extending in the vertical direction at the center in the left-right direction of the windshield. Although a measuring instrument in particular is not limited, For example, thickness gauge like SM-112 made by Teclock Co., Ltd. can be used. At the time of measurement, the curved surface of the windshield is placed on a flat surface, and the edge of the windshield is held and measured by the thickness gauge.

<3. Method of manufacturing outer glass plate and inner glass plate>
Next, an example of the manufacturing method of the outer side glass plate 1 and the inner side glass plate 2 is demonstrated, referring FIG. As an example, the outer glass plate 1 and the inner glass plate 2 can be float glass plates manufactured by the float method.

  FIG. 3 is a view showing a method of manufacturing a float glass plate. In FIG. 3, the direction perpendicular to the sheet is the flow direction of the molten glass 55, and the lateral direction is the width direction of the molten glass 55. In FIG. 4, the change in thickness of the molten glass 55 is exaggerated.

  In the float method, the molten glass 55 is continuously supplied on the molten metal 54 such as molten tin, and the supplied molten glass 55 is formed into a strip shape by flowing on the molten metal 54. The glass thus formed is referred to as a glass ribbon 55.

  Then, in order to suppress the contraction of the glass ribbon 55 in the width direction, both ends in the width direction of the glass ribbon 55 are respectively pressed by the pair of rollers 56. A plurality of the pair of rollers 56 are provided at intervals in the flow direction of the glass ribbon 55. The glass ribbon 55 is moved to the downstream side by the rotation of the plurality of pairs of rollers 16.

  The glass ribbon 55 is cooled toward the downstream side, cooled and solidified, and then pulled up from the molten metal 54. And after being annealed, it is cut off. Thus, a float glass plate is obtained. Here, in the float glass plate, the surface in contact with the molten metal 54 is referred to as a bottom surface, and the opposite surface is referred to as a top surface. The bottom and top surfaces may be unpolished. Since the bottom surface was in contact with the molten metal 54, when the molten metal 54 is tin, the concentration of tin oxide contained in the bottom surface is larger than the concentration of tin oxide contained in the top surface. Become.

  In FIG. 3, when the pair of rollers 56 pulls the glass ribbon 55 in the width direction, the thickness of the glass ribbon 55 increases from the both ends in the width direction toward the center. When the glass ribbon 55 thus formed is solidified and then cut, the outer glass plate 1 is obtained. At this time, there are two ways of cutting out the outer glass plate, as shown in FIG. First, as shown in the right side of FIG. 4, the glass ribbon 55 is cut such that the cut surfaces K1 and K2 extend in the vertical direction. The cut surfaces K1 and K2 extend in parallel, and in the outer glass plate 1A thus obtained, the cut surfaces K1 and K2 are orthogonal to the bottom surface. In another method, as shown on the left side of FIG. 4, the glass ribbon 55 is cut so as to form cut surfaces K3 and K4 perpendicular to the top surface. The cut surfaces K3 and K4 extend in parallel, and in the outer glass plate 1B thus obtained, the cut surfaces K3 and K4 are orthogonal to the top surface. Which cutting method is used depends on the required performance of the windseed obtained as described later. In any case, the outer glass plate 1 is cut out such that the thickness of the upper side 11 is large and the thickness of the lower side 12 is small.

  On the other hand, the inner glass plate 2 is also formed by the float method in the same manner as the outer glass plate 1, but is formed by the known method not using the above-described roller. Therefore, the thickness of the inner side glass plate 2 is formed substantially uniformly.

  Further, since the glass ribbon 55 flows on the molten metal 54, a plurality of streaks extending in the flow direction are formed on the surface thereof. And this streak is also formed on the surface of the cooled float glass plate. And as shown in FIG. 5, the wavelike unevenness is formed in the direction of the streaks on the surface of the inner glass plate 2 by the streaks. 5 is a cross section similar to FIG. 3 and shows a cross section orthogonal to the flow direction of the glass sheet. Similar irregularities are also formed on the outer glass plate 1. However, in each of the glass plates 1 and 2, the unevenness of the bottom surface in contact with the molten metal 54 is smaller than the unevenness of the top surface. Here, that the unevenness is small means that the difference between the deepest portion and the uppermost portion of the unevenness is small. Further, on the surface of the glass plate formed by the float method, in addition to the above-described streaks, unellis extending in a direction orthogonal to this are also formed. The unellis has a pitch greater than that of the streaks, and the size is smaller than the unevenness of the streaks.

  And in the windshield which concerns on this embodiment, as shown in FIG. 6, the 2nd surface 102 of the outer side glass plate 1 and the 1st surface 201 of the inner side glass plate 2 are made into the top surface. As a result, the unevenness of the first surface 101 of the outer glass plate 1 and the second surface 202 of the inner glass plate 2, that is, the surface of the windshield facing the outside is reduced.

  Moreover, in this embodiment, as shown in FIG. 7, the streaks of the outer glass plate 1 and the streaks of the inner glass plate 2 are made to be orthogonal to each other. That is, the streaks 150 of the outer glass plate 1 extend parallel to the upper side 11 and the lower side 12 by the above-described method. On the other hand, since the thickness of the inner glass plate 2 is constant, the direction of the streaks can be adjusted, so that the streaks 250 are cut out from the glass ribbon so as to extend from the upper side 21 to the lower side 22. Thus, the windshield is formed such that the streaks 150 of the outer glass plate 1 and the streaks 250 of the inner glass plate 2 are orthogonal to each other.

  In the manufacture of the outer glass plate 1, if the molding conditions are adjusted, the thickness may be increased from the both ends in the width direction toward the central part, or from one end to the other end in the width direction. It is also possible to increase the thickness as much as possible. The thickness of such a glass ribbon 55 can be adjusted by the circumferential speed of the roller 56 in addition to the tension by the roller 56.

<4. Intermediate film>
The intermediate film 3 has a substantially constant thickness and is formed of at least one layer. As an example, as shown to the enlarged view of FIG. 2, the soft core layer 31 can be comprised by three layers pinched | interposed by the harder outer layer 32 than this. However, the invention is not limited to this configuration, and it may be formed of a plurality of layers including the core layer 31 and at least one outer layer 32 disposed on the outer glass plate 1 side. For example, a two-layer intermediate film 3 including a core layer 31 and one outer layer 32 disposed on the outer glass plate 1 side, or two or more even outer layers 32 on both sides centering on the core layer 31 Alternatively, the intermediate film 3 may be an intermediate film 3 in which an odd number of outer layers 32 are disposed on one side of the core layer 31 and an even number of outer layers 32 are disposed on the other side. When only one outer layer 32 is provided, it is provided on the side of the outer glass plate 1 as described above, in order to improve the damage resistance against external force from the outside of the vehicle or the outside. In addition, when the number of outer layers 32 is large, the sound insulation performance also increases.

  The hardness is not particularly limited as long as the core layer 31 is softer than the outer layer 32. Although the material which comprises each layer 31 and 32 is not specifically limited, For example, the outer layer 32 can be comprised, for example with polyvinyl butyral resin (PVB). The polyvinyl butyral resin is preferable because it is excellent in adhesion to each glass plate and penetration resistance. On the other hand, the core layer 31 can be made of, for example, an ethylene vinyl acetate resin (EVA) or a polyvinyl acetal resin that is softer than the polyvinyl butyral resin that constitutes the outer layer. By sandwiching the soft core layer, the sound insulation performance can be greatly improved while maintaining the same adhesiveness and penetration resistance as the single layer resin intermediate film.

  Generally, the hardness of the polyvinyl acetal resin is controlled by (a) degree of polymerization of polyvinyl alcohol which is the starting material, (b) degree of acetalization, (c) kind of plasticizer, (d) addition ratio of plasticizer, etc. Can. Therefore, even if it is the same polyvinyl butyral resin by adjusting at least one suitably chosen from those conditions, hard polyvinyl butyral resin used for outer layer 32, soft polyvinyl butyral resin used for core layer 31 It is possible to make different. Furthermore, the hardness of the polyvinyl acetal resin can be controlled also by the type of aldehyde used for acetalization, co-acetalization with a plurality of aldehydes, or pure acetalization with a single aldehyde. Although it can not generally be said, the polyvinyl acetal resin obtained using an aldehyde having a large number of carbons tends to be softer. Therefore, for example, when the outer layer 32 is made of a polyvinyl butyral resin, the core layer 31 contains an aldehyde having 5 or more carbon atoms (for example, n-hexyl aldehyde, 2-ethylbutyraldehyde, n-heptyl aldehyde, A polyvinyl acetal resin obtained by acetalizing n-octyl aldehyde) with polyvinyl alcohol can be used. In addition, when predetermined Young's modulus is obtained, it may be limited to the said resin etc.

  The total thickness of the interlayer 3 is not particularly limited, but is preferably 0.3 to 6.0 mm, more preferably 0.5 to 4.0 mm, and 0.6 to 2.0 mm. Being particularly preferred. The thickness of the core layer 31 is preferably 0.1 to 2.0 mm, and more preferably 0.1 to 0.6 mm. On the other hand, the thickness of each outer layer 32 is preferably 0.1 to 2.0 mm, and more preferably 0.1 to 1.0 mm. In addition, the total thickness of the intermediate film 3 can be made constant, and the thickness of the core layer 31 can be adjusted in this.

  The thicknesses of the core layer 31 and the outer layer 32 can be measured, for example, as follows. First, the cross section of the windshield is enlarged 175 times and displayed by a microscope (for example, Keyence VH-5500). And thickness of core layer 31 and outer layer 32 is specified by visual observation, and this is measured. At this time, in order to eliminate variations due to visual observation, the number of measurements is made five times, and the average value thereof is made the thickness of the core layer 31 and the outer layer 32.

  The total thickness of the interlayer 3 is not particularly limited, but is preferably 0.3 to 6.0 mm, more preferably 0.5 to 4.0 mm, and 0.6 to 2.0 mm. Being particularly preferred. The thickness of the core layer 31 is preferably 0.1 to 2.0 mm, and more preferably 0.1 to 0.6 mm. On the other hand, the thickness of each outer layer 32 is preferably larger than the thickness of the core layer 31, and specifically, preferably 0.1 to 2.0 mm, and 0.1 to 1.0 mm. Is more preferred. In addition, the total thickness of the intermediate film 3 can be made constant, and the thickness of the core layer 31 can be adjusted in this.

  The thicknesses of the core layer 31 and the outer layer 32 can be measured, for example, as follows. First, the cross section of the windshield is enlarged 175 times and displayed by a microscope (for example, Keyence VH-5500). And thickness of core layer 31 and outer layer 32 is specified by visual observation, and this is measured. At this time, in order to eliminate variations due to visual observation, the number of measurements is made five times, and the average value thereof is made the thickness of the core layer 31 and the outer layer 32. For example, a magnified image of the windshield is taken, and the core layer and the outer layer 32 are specified in this to measure the thickness.

  Although the manufacturing method in particular of intermediate film 3 is not limited, for example, after mixing resin components, such as polyvinyl acetal resin mentioned above, a plasticizer, and other additives if needed and kneading it uniformly, each layer is put together The extrusion molding method, and the method of laminating two or more resin films prepared by this method by a pressing method, a laminating method or the like. The resin film before lamination used in the method of laminating by the pressing method, laminating method or the like may have a single layer structure or a multilayer structure. Further, the intermediate film 3 can be formed in one layer in addition to the formation of the plurality of layers as described above.

<5. Shielding layer>
As shown in FIG. 1, a shielding layer 4 is laminated on a dark ceramic such as black on the periphery of the windshield. The shielding layer 4 shields the view from inside or outside the vehicle, and is laminated along the four sides of the glass plates 1 and 2.

  In the present embodiment, the shielding layer 4 is laminated on the second surface 102 of the outer glass plate 1 and the second surface 202 of the inner glass plate 2. This point will be described in detail. FIG. 8 is a cross-sectional view of the vicinity of the center in the left-right direction of the outer glass plate, and FIG. 9 is a cross-sectional view of the vicinity of the center in the left-right direction of the inner glass plate. As shown in FIG. 8, the shielding layer 4 is laminated along the peripheral edge on the second surface 102 of the outer glass plate 1, but the shielding layer 4 laminated along the lower side 12 is from the lower side 12. The thickness decreases as it goes to the upper side 11. On the other hand, the thickness of the shielding layer 4 stacked along the upper side 11 also decreases as going from the lower side 12 to the upper side 11. On the other hand, as shown in FIG. 9, the thickness of the shielding layer 4 laminated on the inner glass plate 2 is substantially the same. In addition, it is preferable that it is 5-20 micrometers, for example, and, as for the thickness of the shielding layer 4 laminated | stacked on each glass plate 1 and 2, it is more preferable that it is 10-15 micrometers. This is because if the thickness of the shielding layer 4 is smaller than 5 μm, the shielding performance is reduced. On the other hand, if the thickness is larger than 20 μm, the distortion described later becomes remarkable, or the edge of the shielding layer 4 collapses to deteriorate the appearance. In addition, when the shielding layer 4 is formed into a dot shape, adjacent dots are combined and the appearance becomes worse. Moreover, the change of the thickness of the shielding layer 4 shown in FIG. 8 is exaggerated for description. This point is the same in FIG. 10 described later.

Moreover, although the shielding layer 4 can be formed with various materials, such as a ceramic, it can be set as the following compositions, for example.
* 1, main component: copper oxide, chromium oxide, iron oxide and manganese oxide * 2, main component: bismuth borosilicate, zinc borosilicate

  The ceramic can be formed by screen printing, but it can also be produced by transferring a baking transfer film onto a glass plate and baking it. When screen printing is employed, for example, polyester screen: 355 mesh, coat thickness: 20 μm, tension: 20 Nm, squeegee hardness: 80 degrees, mounting angle: 75 °, printing speed: 300 mm / s, drying furnace Drying at 150 ° C. for 10 minutes can form a ceramic.

  Here, a method of laminating the shielding layer 4 on the outer glass plate 1 will be described with reference to FIG. 10 by taking screen printing as an example. As shown in FIG. 10, first, the outer glass plate 1 is placed on a horizontal table 500 with the first surface 101 facing down. Next, the shielding layer 4 is printed by screen printing, and at this time, the screen 501 is disposed parallel to the first surface 101. Subsequently, while moving the squeegee 502, the material 503 for the shielding layer is printed on the periphery of the second surface 102 through the screen 501.

  At this time, since the screen 501 is disposed in parallel to the first surface 101, the gap between the screen 501 and the second surface 102 is larger at the lower side 12 and becomes smaller as it goes to the upper side 12. Therefore, when screen printing is performed, on the second surface 102 of the outer glass plate 1, the thickness of the shielding layer 4 printed on the lower side 12 side is large, and the thickness of the shielding layer 4 decreases toward the upper side 11. Thereby, the shielding layer 4 which the above thickness changes can be formed.

  The ceramic is likely to be in close contact with the bottom surface of the glass ribbon 55 described above. This is because the concentration of tin oxide at the bottom surface is high. Accordingly, when the shielding layer 4 is formed of ceramic, it is preferable to form it on the bottom surface.

<6. Windshield manufacturing method>
Next, a method of manufacturing the windshield will be described. First, the manufacturing line of a glass plate is demonstrated.

  Here, the mold will be described in more detail with reference to FIG. FIG. 11 is a plan view of the mold. As shown in FIG. 11, this forming die 800 is provided with a frame-like die main body 810 that substantially matches the outer shape of both the glass plates 1 and 2. Since the mold body 810 is formed in a frame shape, it has an internal space 820 penetrating in the vertical direction inside. Then, the peripheral edge portions of the flat glass plates 1 and 2 are placed on the upper surface of the mold body 810. Therefore, heat is applied to the glass plates 1 and 2 from the heater (not shown) disposed on the lower side through the internal space. As a result, both the glass plates 1 and 2 are softened by heating and curved downward by their own weight. In addition, the shielding board 840 for shielding heat may be arrange | positioned to the inner periphery of the type | mold main body 810, and the heat which the glass plates 1 and 2 receive can be adjusted by this. Also, the heater can be provided not only below the forming die 800 but also above it.

  Next, the molding method will be described with reference to FIG. FIG. 12 is a side view of the furnace through which the mold passes. First, the shielding layer 2 described above is laminated on the outer glass plate 1 and the inner glass plate 2 before bending. Next, the outer glass plate 1 and the inner glass plate 2 are stacked and, while being supported by the forming die 800, pass through the heating furnace 802 as shown in FIG. When heated to near the softening point temperature in the heating furnace 802, both the glass plates 1 and 2 are curved downward inside by the own weight than the peripheral portion and are formed into a curved surface. Subsequently, both the glass plates 1 and 2 are carried from the heating furnace 802 to the annealing furnace 803, and annealing is performed. Thereafter, both glass plates 1 and 2 are carried out of the annealing furnace 803 to the outside and allowed to cool.

  Thus, when the outer glass plate 1 and the inner glass plate 2 are formed, the intermediate film 3 is subsequently sandwiched between the outer glass plate 1 and the inner glass plate 2. The intermediate film 3 has a slightly larger shape than the outer glass plate 1 and the inner glass plate 2. Thus, the outer edge of the intermediate layer 3 is in a state of protruding from the outer glass plate 1 and the inner glass plate 2.

  Next, the laminated body in which both the glass plates 1 and 2 and the intermediate film 3 are laminated is put in a rubber bag and prebonded at about 70 to 110 ° C. while vacuum suction is performed. Other pre-adhesion methods are possible, and the following method may be adopted. For example, the laminate is heated at 45 to 65 ° C. in an oven. Next, this laminate is pressed by a roll at 0.45 to 0.55 MPa. Then, after heating this laminated body again at 80-105 degreeC by oven, it presses with a roll again at 0.45-0.55 MPa. Thus, pre-adhesion is completed.

  Next, main bonding is performed. The pre-bonded laminate is subjected to main bonding by an autoclave at, for example, 8 to 15 atm at 100 to 150 ° C. Specifically, for example, the main adhesion can be performed under the conditions of 14 ° C. and 135 ° C. The intermediate film 3 is adhered to the glass plates 1 and 2 through the above-described pre-adhesion and main adhesion. Finally, the intermediate film 3 protruding from the outer glass plate 1 and the inner glass plate 2 is cut to complete the windshield. In addition, the curved windshield can also be manufactured by methods other than this, for example, press work.

<7. Head-up display device>
Next, the head-up display device will be described. A head-up display device (referred to as a HUD device) projects information such as the vehicle speed on a windshield. However, it is known that with this HUD device, a double image is formed by the light projected onto the windshield. That is, since the image visually recognized by reflecting on the inner surface of the windshield and the image visually recognized by reflecting on the outer surface of the windshield are separately viewed, the images are doubled.

  In order to prevent this, the outer glass plate 1 as in this embodiment uses a wedge-shaped windshield. That is, as shown in FIG. 13, in the windshield, at least in the display area where light is projected from the HUD device 500, the thickness is formed to be smaller as it goes downward. As a result, the light reflected by the inner surface of the windshield (the second surface 202 of the inner glass plate 2) enters the vehicle and the light is reflected by the outer surface of the windshield (the first surface 101 of the outer glass plate 1) Because the light incident on the light substantially matches, the double image is eliminated. The depression angle α of the windshield 1 at this time, that is, the angle between the first surface 101 and the second surface 101 of the outer glass plate 1 depends on the installation angle of the windshield 1, for example, 0.01 It can be made into -0.04 degree (0.2-0.7 mrad).

<8. Feature>
According to the windshield according to the present embodiment, the following effects can be obtained.
(1) The coefficients of linear expansion of the shielding layer and the glass are different. For example, the linear expansion coefficient of the shielding layer (ceramic) described above is 70 × 10 ^{−7 to} 100 × 10 ⁻⁷ / ° C., and the linear expansion coefficient of glass is 1 × 10 ⁻⁶ to 10 × 10 ⁻⁶ / ° C. It is. Therefore, in the area where the shielding layer is formed, compressive stress or tensile stress is generated at the time of molding, and distortion occurs in the vicinity of the boundary between the area where the shielding layer 4 is formed and the area where the shielding layer 4 is not formed. Will occur. As a result, when viewed from the inside of the vehicle, the image outside the vehicle may appear deformed due to this distortion.

  On the other hand, in the present embodiment, in the shielding layer 4 on the lower side 12 side, the thickness is smaller along the upper side 11 side, so the shielding layer 4 near the boundary becomes smaller. Thereby, the influence of the distortion of the deformation of the glass plates 1 and 2 by the shielding layer 4 can be reduced. As a result, deformation of the image can be suppressed.

  On the other hand, since the thickness of the shielding layer 4 on the upper side 11 increases toward the lower side 12, the distortion of the glass plates 1 and 2 at the boundary is considered to be large. As we see on the side are mainly sky, it is extremely rare that deformation of the image becomes a problem during operation.

(2) When the shielding layer 4 is formed by screen printing as described above, it is possible to form the shielding layer 4 whose thickness decreases from the lower side 12 to the upper side 12. Therefore, it is possible to easily form the shielding layer whose thickness is changed. However, in this method, although the thickness in the vicinity of the boundary is increased in the shielding layer 4 on the upper side 11 side, as described above, the problem is extremely rare.

(3) Since the shielding layer 4 is formed at the same position on both the outer glass plate 1 and the inner glass plate 2 with substantially the same width and the same thickness, both the glass plates 1 and 2 have substantially the same shape. It can be molded. As a result, at the time of the above-mentioned autoclave, both the glass plates 1 and 2 can be bonded together without deforming generally. Therefore, since it can prevent that an unnecessary force acts on the laminated glass plates 1 and 2, the crack of the glass plates 1 and 2 can be prevented also at the time of manufacture and after manufacture. Moreover, if the shielding layer 4 is laminated | stacked on the 2nd surfaces 102 and 202 in both the glass plates 1 and 2, since it can use the same metal mold at the time of press molding, the advantage that productivity becomes good There is also.

(4) In the said embodiment, the bottom face with the small unevenness | corrugation by a streak is made into the outer surface of a windshield. That is, since the two outer surfaces of the windshield both have small irregularities, it is possible to reduce perspective distortion when the object outside the vehicle is viewed from inside the vehicle through the windshield.

(5) In the said embodiment, both the glass plates 1 and 2 are arrange | positioned so that the streak 150 of the outer side glass plate 1 and the streak 250 of the inner side glass plate 2 may orthogonally cross. On the other hand, for example, when the streaks 150 and 250 of both glass plates 1 and 2 extend in the same direction, the streaks on the outer surface of the windshield and the streaks on the outer surface combine, and the entire windshield There is a possibility that the change in thickness as This may increase perspective distortion. Therefore, in the present embodiment, since the streaks 150 and 250 of both the glass plates 1 and 2 are orthogonal to each other, it is possible to prevent an increase in unevenness and thereby suppress perspective distortion.

<9. Modified example>
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible unless it deviates from the meaning. And several modification shown below can be combined suitably.

<9-1>
In the said embodiment, although the outer side glass plate 1 and the inner side glass plate 2 are arrange | positioned so that top surfaces may oppose, it is not limited to this. For example, the bottom surfaces can be arranged to face each other. Also, the top surface and the bottom surface can be arranged to face each other.

  As described above, when the bottom surface is the outer surface of the windshield, there is an advantage that the perspective distortion can be suppressed, but it is advantageous to laminate the shielding layer 4 of ceramic from the bottom surface. Therefore, depending on the application, it may be considered which surface is to be opposed. In addition to the shielding layer 4, such a bottom surface is also suitable for laminating an antenna element made of, for example, copper or silver by printing or the like.

<9-2>
Although the shielding layer 4 is provided in both the outer side glass plate 1 and the inner side glass plate 2 in the said embodiment, the shielding layer 4 can also be provided only in the outer side glass plate 1. That is, the shielding layer 4 can be provided on at least one of the surfaces of the outer glass plate 1 and the inner glass plate 2. In addition, what provided the shielding layer 4 in the outer side glass plate 1 is corresponded to the glass plate module of this invention. Moreover, what provided the shielding layer 4 in the inner side glass plate 2 is corresponded to the glass plate module of this invention.

<9-3>
In the said embodiment, although the inner side glass plate 2 is made flat, the inner side glass plate 2 can also be formed in wedge shape like the outer side glass plate 1. In this case, as described above, in addition to providing the shielding layer 4 on both the glass plates 1 and 2, the shielding layer 4 may be provided only on the second surface 102 of the outer glass plate 1. The shielding layer 4 can be provided only on the surface 202.

  Moreover, both glass plates 1 and 2 can also be formed in flat form. That is, distortion occurs near the boundary between the region where the shielding layer 4 is formed and the region where the shielding layer 4 is not formed, because distortion may occur not only in the wedge-shaped glass plate but also in the flat glass plate. Therefore, for example, distortion can be prevented by forming both the outer glass plate 1 and the inner glass plate 2 in a flat plate shape, and providing the shielding layer 4 with a variable thickness as described above. From this point of view, if the shielding layer 4 described above is provided in any of the outer glass plate 1 and the inner glass plate 2, it corresponds to the glass plate module of the present invention.

<9-4>
In the said embodiment, although it is made for the crosses of the outer side glass plate 1 and the inner side glass plate 2 to be orthogonal, it can also be made parallel.

<9-5>
The shape of the shielding layer 4 is not particularly limited, and various shapes are possible. For example, a shielding layer provided with a window can be formed to allow light emission by a sensor and external photographing by a camera.

  Moreover, the shielding layer 4 in which the thickness mentioned above changes may be provided only at least on the lower sides 12 and 22 side. Therefore, for example, shielding layers with a constant thickness may be provided on the right sides 13 and 23, the left sides 14 and 24, and the upper sides 11 and 21.

<9-6>
The method of forming the outer glass plate 1 and the inner glass plate 2 in a wedge shape is not particularly limited, and methods other than those described above are also possible.

1 Outer glass plate (first glass plate)
2 inner glass plate (second glass plate)
3 Interlayer

Claims (8)

A rectangular first glass plate having a first surface and a second surface and having an upper side, a lower side, a right side, and a left side at the periphery;
A first shielding layer laminated along the peripheral edge on the first surface or the second surface of the first glass plate;
Equipped with
The said 1st shielding layer formed along the said lower side is a glass plate module formed so that thickness may become thin as it goes to the upper side from the said lower side.   The glass sheet module according to claim 1, wherein the first glass sheet is formed to be thinner in thickness from the upper side to the lower side.   The glass sheet module according to claim 2, wherein the first shielding layer formed along the upper side is formed so as to decrease in thickness as it goes from the lower side to the upper side. The first glass plate has different concentrations of tin oxide on the first surface and the second surface, respectively.
The glass sheet module according to any one of claims 1 to 3, wherein the shielding layer is laminated on a surface of the first surface and the second surface where the concentration of the tin oxide is high. A first glass sheet module according to any one of claims 1 to 4;
A rectangular second glass plate having a first surface and a second surface and having an upper side, a lower side, a right side, and a left side at the periphery so as to correspond to the first glass plate;
An intermediate film sandwiched between the second surface of the first glass plate and the first surface of the second glass plate;
Equipped with
A windshield, wherein the second glass plate is formed in a flat plate shape. The first glass plate and the second glass plate have different concentrations of tin oxide on the first surface and the second surface, respectively.
The low concentration surface of the tin oxide in the first glass plate constitutes the second surface,
The windshield according to claim 5, wherein a surface of the second glass plate having a low concentration of tin oxide constitutes the first surface. A first glass sheet module according to any one of claims 1 to 4;
A rectangular second glass plate having a first surface and a second surface and having an upper side, a lower side, a right side, and a left side at the periphery so as to correspond to the first glass plate;
A second shielding layer laminated along the peripheral edge on the first surface or the second surface of the second glass plate;
An intermediate film sandwiched between the first glass sheet module and the second glass sheet;
Equipped with
The second glass plate is formed to be thinner from the upper side to the lower side,
A windshield, wherein the second shielding layer has the same width and thickness as the first shielding layer. The first shielding layer is laminated on a second surface of the first glass plate,
The second shielding layer is laminated on a second surface of the second glass plate,
The windshield according to claim 7, wherein the intermediate film is disposed between the second surface of the first glass plate and the first surface of the second glass plate.